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That link^ is a bit outdated as [http://www.mozilla.org/en-US/mobile/17.0/releasenotes/ mobile Firefox supports ARMv6 as of Firefox 17.0] and for [http://www.mozilla.org/en-US/mobile/19.0/releasenotes/ mobile Firefox 19.0 the requirement for cpu was reduced from 800MHz to 600MHz]. It is also recommended for the device to have 512+MB RAM at minimum still.